Dish home was not working on my 508 reciever's. If both 110 even and odd was x'd out the channel (dish home ch100) wasn't even on the guide along with 9900 and couple of others. When I got a partial check switch say 110 odd and x'd even. Ch100 would be on the guide but would exit out and go to previuos channel after it flashed no signal, even though I was getting a signal.
Only after going through the whole thing of unplugging all the receivers and and getting a successful check switch would dish home show up.
So it is related to the slow tuning or no tuning of the 110 satelite and the failing check switches.
If you can run a check switch and get it to pass every time first time, count yourself lucky. I have to go through a full reset with the 508 as the ony reciever to get a pass.